"While it was happening, I very calmly had the thought that I was likely going to die," the Delta Air Lines passenger recalled.

After Delta Flight 4819’s cabin rolled upside down and came to rest in a terrifying crash landing at Toronto Pearson International Airport, a flight attendant stood on what had been the ceiling – one leg propped on an upturned baggage compartment – and addressed passengers who’d unbuckled themselves from inverted seats.